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barriers, and crnnstruction precautions for concrete aver-pows at tbe tops nf <br /> the drilled piers. <br /> i) Froper det�ilxng of consiruction and contro�joints for conc�ete slabs shall be <br /> considere�i in the final design af sidewalka and patios in areas of expansive <br /> soils. For example,a oc�nsfr�.ction joint with reb�r dowels may be provided <br /> when oancreb�slabs on grade meet the pm�osed perimeter foundation for <br /> the residence to minimize vertical affset from sail exp�siea or shrinkage. <br /> J) A detailed creek bank evalua�tiion sh�ll be performed during the fin�l <br /> gentechnical investigation ance gradin,g and improve�m�nt plans are <br /> available, <br /> k} The design-Ievel geotechnica�invesbigation for Lat 13 and alI lo#s along the <br /> downhill side of La�urel Way shall evaluate the potential far creek bank <br /> erosiaa or iandsliciing, and parovide mitigation measures as appropriate. <br /> I) All praposed structu�res and improvements shall be set an appropriate <br /> distance from the top of the existing creek banks as determined by the City <br /> �nd per the roquirements of Zoning Ordinance Sectipn 32.12. <br /> m) Conaideration s},all be given to biotechnical ereek bar�k stabiliza#ion <br /> methods and li�iting surfa�e wa#er runofF into tho creek• <br /> n} Install a subdrain system of perforater�pipe and permeable drain rocic or <br /> gravel as needed ta zr�iti�gate poteau�ia,l springs that cauld o�cur during the <br /> winter. Subdrains shall be inst�lled where geepage is obs�rved, and a <br /> conceptual subdx�ain plan shali be�pared o�ee gt'�S p1���ve been <br /> finalized. <br /> o) A geotechnical engineer shall be an site duzi�o.g or just€ollawing hcavy <br /> rainatarms to evafuate and map the locationa of sprin�s on the site, and <br /> provide recommendations for miiigating the adverse impaets of springs or <br /> seepa,if neces�ary. <br /> p) The shallaw landslide area an Lots l4 and 15 shall be aompletely removed <br /> dov�m to bedrock, and the grade rebuilt with a keyed and�enched <br /> engineered buttress fill containitig subclrains. <br /> q) Furthet evaluation af the questionahle landslide nea�'the bottom af Lots 3 <br /> �nd 4 shall be performed during the desigu-Ievel geotechnical investigations <br /> for L.ats 1 t�arough 4 to provide d�tail.ed reoommendations for keyways, <br /> benching, and subdraans.The design-level geotechnical inveahgation shall <br /> detemYine wh�ther miti�ation is nee�ed#o reduce the potential for damage <br /> ta the plaaned site improv�ments and the potentia.�for adversely affecting <br /> mci�hboring p:roper�ies. <br /> r} Th�bottarn of the�ia-retention basi�ns on Lats 5, 7,$,g� � ���1 be <br /> lined with HDPE linex to Zimit water infiltration into the native sails below <br /> the�ermeable filter soils.A subdrain shall be installed abo�e the HDP� <br /> limer to intercept the excess water and direct it to a suita�ale disahaYge point. <br /> The specific racaacmendationa far the HDPE liner system a�nd subdrains <br /> sha3.1 be presented in the design-level geotechnical report. <br /> 23 <br />